Drag Definition and 713 Threads

here's the problem: A projectile of mass "m" is launched from ground level at an angle of "theta" above the horizontal and with an initial speed "v". The flight of the projectile is resisted by an aerodynamic drag force modeled as uv^2, where "v" is the speed of the projectile and "u" is the...

Drag coefficient formula? What is the formula for finding this out? Sorry, for being n00bish and for this not being posted in the relevant forum but this one has the most people viewing so I thought I'd get the quickest response this way. Thanks. O yea, I've tried searching, but sifting...

Hi all, For the past few years, building model rockets has been a hobby of mine. I've designed a few of my own, and I'd like to be able to do stability, height, etc. calculations before actually building the rocket. My question: If you know the mass of the rocket, the magnitude of the force...

Can anyone give me a relationship for the turbulent drag force on an object with a cross sectional area A and a speed v in a medium with density p please? Thanks

hi, i am trying to show that dv/(1- (v^2/v_ter^2)) = g*dt which after integrating is v=v_ter*tanh(g*t/v_ter) (motion with quadratic drag) can also be obtained by using natural logs. so far i have this: letting u = v/v_ter i can use partial fractions to get du/(1-u^2) = 1/2...

Why does an object in a fluid experience both a buoyancy force and a drag force? How are they different and what causes these two different forces? Thanks. :-)

A few of us in another forum are talking about if it's possible to even hold onto a motorbike with no fairing or windshield at 300 mph. This is the bike in question, http://www.dodge.com/tomahawk/flash.html Any idea what the drag co of this bike is, and how many kilograms of air pressure at...

Im doing research on skydiving and I am trying to find out how much drag is created on different jumps. I have different velocities for each of the jumps. D = Cd ((rV^2)/2)A That is the equation I am using. r is air density which I am using 1.2 kg/m^3. V is the velocity. And I've...

How would one go about proving the formula D = 1/2C(rho)A(v^2) I have a suspicion momentum can be used to the show the derivation of this, right ?

If a vehicle could continuously cool the air in front of it and heat the air behind it, the air in front should contract and the air behind expand, reducing the pressure in front of the vehilce and increasing it behind the vehicle. This should pull the vehicle into the cooler air at the front...

could someone tell me how to derive the equation for drag or send me a site that can do it. Fd = [Coefficient of drag * density * Area (cross-sectional)*v^2 ] / 2

a crate falls from an airplane flying horizontally at an altitude of 2,000 m. neglecting air drag, howlong will the crate take to strike the ground/ is the formula t = d/v help

Since my other thread is lacking attention, perhaps it is more suitable here: I inserted some fixed constants and multiplied out (48/.5)(1-^e-.5t)(sin 45) + (9.8/.25)(1-(.5t) - e^-.5t) = 0 (96 - 96e^-.5t)(sin 45) + 39.2(1-(.5t)-e^-.5t) = 0 67.88 - 67.88^e-.5t + 39.2 - 19.6t -...